A7 B7 3U1636 五、發明説明（ί ) 發明背景 發明之領域 (請先閲讀背面之注意事項再填寫本頁) 本發明一般係關於一種用於腳踏車之座墊懸吊糸統， 尤指一種提供高度防震特性且設計可靠、製造成本低的座 墊懸吊系統。 相關前技之說明 4 一典型低成本腳踏車之標@ i構包括一支承於一對為 相對小形充氣輪胎之車輪上的剛性支架。如此结構之缺失 為該腳踏車不能防止當騎使於不規則的路面上時所經受的 震動。該種輪胎一般僅能防止極小的震動。藉此•於騎使 中所經受的許多震動被直接轉遞至騎乘者，當騎乘者持鑛 一段時間騎使會特別不舒服。此外，近期許多騎車愛好者 者熱衷使用一登山車於野外環境中騎使。這種騎使狀況一 般含有非常崎嶇的地形，且騎乘者所經受的震動可能不容 忽視。 經濟部中央標準局員工消費合作社印策 已作出許多苜試藉由將各種懸吊系統加入腳踏車框架 的設計中κ提升腳踏車騎乘的舒適性。該種系統可包括諸 如一種包含有樞設後辣撐條或振動臂之防震後部懸吊糸統 。然而，此棰糸統係為製造昂貴且相當可觀的加入至腳踏 車的成本。藉此，一般情況為該等系統僅應用於昂貴的頂 極腳踏車。其结果為，存在一值得考應；的需要以改進相對 價廉或低極的腳踏車之騎使的舒適感其主要被使用以達輕 鬆愉快之騎乘目的。 本紙張尺度適用中國國家標準（CNS } A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印裝 301636 A7 _B7_ 五、發明説明（2 ) 於腳踏車騎乘中所經受的許多震動經由一般支承大部 分騎乘者體重的腳踏車座墊傳遞至騎乘者。為改進騎使之 舒適，座墊被設計加入襯墊。然而*此種襯墊當騎乘者踩 踏板時阻礙其大腿的動作，要求儘力作用於騎乘者之該部 分。座墊懸吊系統的形式為已知其中該座墊藉由一壓縮彌 簧設置支承且怡好安裝於該腳踏車框架之座墊管Μ此該壓 縮彈簧得以吸收傳遞至座墊的震動。該等系統可高效改進 騎使之舒適感。一種如此之糸統例如於1991年9月3 日發表的美國專利第5，044，648由Knapp所揭示。 座墊懸吊糸統一已知缺失係關於一座墊管壓縮强簧設 置，儘管該等糸統較後部框架為價廉，但其對结構而言仍 非常昂貴且僅應用於價格昆貴的頂極腳踏車或作為價格昂 貴的修護零件市埸之配件。如此之已知糸統一般要求使用 昂貴的材料、專門定製的部分和緊公差製造技術。這些可 參照上述所提及的Knapp專利中理解，其中於此專利中所揭 示的结構可看到包含大量的金鼷切割、研磨和攻絲操作以 達成一起作用的產品。由於其高昂的價格，該等系統通常 不使用於相對低極腳踏車的最初設備製造。 另，期望提供一用以腳踏車的座墊懸吊糸統，其製造 成本低廉Μ此可被製造應用於低極腳踏車。更*期望提供 一如此之糸统其就腳踏車正常使用籌命上達成令人滿意的 使用功效具有可靠的設計。 發明概要 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X29"?公釐） (請先閱讀背面之注意事項再填寫本頁) L -裝------·一 丁__ V5 經濟部中央標準局員工消費合作杜印裝 A7 B7 五、發明説明（3 ) 本發明賴由提供一用於腳踏車之座塑懋吊系統以解決 前技中之缺失•該座墊懸吊系統包括一外部一般長形中空 管和一套合承接於該外管內的內部一般長形中空管。滾珠 袖承座圈如K金靥形式被設置於內、外管内•且滾珠輸承 設置於該座圈內。該内管具有一内端安装有一套管K此該 套管滑設於外管內。一壓縮彈簧設置於該内管之内端和一 經外管延伸之阻止梢間。該軸承和套管配合K容許該内管 於外管内之縱向作動但防止内外管間之相對側向和旋轉作 動。藉由此结構，一座墊懸吊糸統可由標准篛單製備的材 料構成且無需昂貴的製造步驟•仍將提供一高效和可靠的 產品。 圖式簡單說明 本發明上述及另一些新穎的特性和優點將藉由參照所 鼷附圖閱謓下列詳细描述更好的被理解，其中： 第一圖係為依照本發明之原理一腳踏車座墊懸吊糸統 構造之側面剖視圖； 第二圖係為該懸吊系铳姐件外管的端視圖； 第三圖係第二圖中3—3處之剖面示意圖； 第四圖係為該懸吊糸統組件内管之側視圖； 第五圖係為第四中5—5處之剖面示意圖； 第六圖係為構成該組件之成型模的端視圖； 第七圖係為第六圖中6 - 6處該成型模的側面剖視圖 ;和 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) ".•裝------訂-----^線 經濟部中央標準局員工消費合作社印製 A7 B7 發明説明u ) 第八圖係為用於該組件構造之彈簧插入工具的側視圚 〇 較佳實施例詳细說明 現參照附圖，首先參照第一圖所示* 一用於腳踏車之 座墊懸吊系統以一組合形式表示，一般由參照數字1 〇表 明。該組件1 〇包括其首要構件—外部的、一般為長形 的中空管1 2和一内部概略長形的中空管1 4。兩者長管 12和14最好横截面為圓形且由已知技術中之焊接接缝 網管構成，當然無鏠管和各種金屬合金材料的使用亦為同 漾可能的。最好參看第一至第三圖所示，該外管1 2將如 下所述於其上端1 9形成一對縱向相對的滾珠袖承座圈1 6 ° 該内管14同樣亦形成一對互補的座圈1 8。滾珠軸 承20被設置於座圈16和18内。儘管於第一圖中所示 於每對座圈1 6和1 8内有五個滾珠抽承20，但本發明 不限制任何特定數量的滾珠軸承。又，儘管兩對相對的座 圈1 6和1 8被示出*但如果需要該組件1 0可具有附加 的座圈。 參照第一和第四圖，可看到該内管1 4包括一低部頸 端22。一環形尼龍製套管24被安裝於該端22且由一 横向梢26固定。一壓縮彈簧28抵靠該內管1 4之下端 2 2且藉由一横向阻擋梢3 0保持於外管1 2內。該套管 24延伸超出該内管1 4的下端22，藉此提供一凹槽3 -7- 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公嫠） -------L丨_{-裝------訂-----ί .線 (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 A7 B7五、發明説明u ) 1K供保持該彈簧28對准該管道端部22。該内管14 的另一端3 2設置一圓形珠緣3 4和一長形珠緣3 6。該 端部3 2藉由一腳踏車座墊組件之合適的夾具（未示）承 接，藉此該珠緣34和36用K怡當的定位該座墊。該端 部3 2亦可以前技之已知方法設置一完整的夾具（未示） 〇 該懸吊系統組件10之構造可示出藉由首先形成具有 座圈1 6之外管1 2使用一合適的心軸且令該心軸被壓入 該外管1 2之端部而易於達成。随之，該内管1 4形成有 一薄棋和心軸以包括該座圈1 8、頸縮端2 2和該珠緣3 4和36。該安裝於套管24之内管14隨之被插入外管 12且該滾珠袖承20被置入該座圈16和18·再者依 據本發明，例如第六和第七圖所示之合適薄模4 0被置於 該等長管1 2和14上且迫緊於外管座圈1 6，接該鑲 模40之封閉槽42阻擋且封閉該座圈1 6之端部，形成 如第一圖中所示的圓形端44。於此操作後，防止該長管 1 2和1 4被分隔開且該滾珠軸承20被限制於座圈1 6 和1 8内。再者，彈簧28藉由如第八圖所示之一適當工 具46被插入且壓縮。該工具46具有叉齒4 8其哨合彈 簧2 8但容許定位梢3 0被插入保持該彈簧2 8於此位置 。一適當手風琴狀橡皮套（未示）可被安裝於該長管12 和14之間Μ供保護該組件1〇之内部組成物不被水或外 部物質污染。該组件10随之即於此位置被夾緊於腳踏車 一 8 一 (請先閲讀背面之注意事項再填寫本頁) 丨裝. 、νβ 線 本紙張尺度逋用中國國家標準（CNS ) Α4規格（2丨0X297公釐） 301636 A7 經濟部中央標準局員工消費合作社印製 B7五、發明説明（έ ) 框架之座墊管内，此後該座墊可被安装。 該内、外管1 2和14之结構内，最好對軸承座圈1 6和1 8進行熱處理或表面硬化，K此目前於該組件1 〇 之正常使用中該等座圈可令人滿意的經受住外力。該管道 12和14亦可鍍鉻Μ加強座圈16和18的硬度。由於 一般腳踏車框架之座墊管通常形成一與水平圼6 9至7 4 度之角度，一不容忽視的横向合成力可作用於軸承20。 藉此，該座圈1 6和1 8如果被適當的硬化將具有一較長 的使用薷命。又•最好如第三圖所示，該外管可設置一組 小孔5 0以供有選擇的承接該阻擋梢3 0位於幾個縱向位 置之一者。Μ此方式該彈簧2 8可被預壓至幾棰狀況中之 任一種令該组件10可根據騎乘者不同的重置調節。 現可Μ理解本發明之座墊懸吊糸統10提供一與前技 裝置大不相同的高度經濟的組件。該組件1 0藉由相對低 成本的金鼷形成技術，諸如壓制和鍛造構成。此與由機械 加工和金靥切削操作諸如研磨、切割和攻絲製成的前技組 件有很大的不同。又，該組件1 0不需被製造為具有緊公 差。例如，該内管可具有任何適當的内徑或外徑，只要其 能以套合方式承接於外管1 2內且該軸承座圈1 8和管端 22可適當的形成•其亦由於尼龍套管24怡可對淮和固 定内管1 4。此外，兩者定位梢26和30皆可為已知可 膨脹彈簧滾動梢形式和以此其穿經的小孔不需保持緊公差 。甚至更進一步，由於許果該軸承20於組裝後太鬆，該 IJ I I -I n I I L i I I (請先閱讀背面之注意事項再填寫本頁) 訂 •線 本紙張尺度適用中國國家梯準（CNS ) A4規格（210X297公釐） 經濟部中央橾準局員工消費合作社印製 A7 _B7_ 五、發明説明（Γ)) 外管12可簡單的輕微形成椭圓形（如用一老虎钳）K擰 緊該袖承2 0 *該座圈1 6和1 8可不需形成容置緊公差 。同樣，如果它們太緊，該軸承20可被放鬆。該組件1 0之另一實用特性為如所揭示的僅需要一簡單的薄模40 Μ令封閉的套管1 6彎曲。此结構令人滿意一起容置該組 件10且不需如已知技術中攻絲外管和使用一些類型的端 蓋。再者，該套管24不經受充分的側向力，其可由相對 低價的材料諸如尼龍製成，而與習用技術中已知的另一些 糸統不同。另，由於該套管不執行如前技糸統中所要執行 的任何鐽结功能，其可為一簡單的環形件且不具有復雜的 形狀。一螺旋彈簧28取代已知橡膠彌簧的使用，容許利 用一簡單的梢3 0來保持該彈簧2 8於定位。梢一般無法 一令人滿意之方式支承橡膠彈簧。此外，該可調節的弹簧 2 8預壓特性不需已知復雜機器僅藉可選擇定位梢3 0之 定位的使用而達成。 亦可理解儘管該组件10較為簡單但其有高度的功效 且性能穩定。該等套管1 2和1 4之緊密的開關僅藉由軸 承2 0防止該腳踏車座墊於使用中不期望有的扭轉且不需 特殊形狀的內管。另，事實上與所示出的一體研磨相反， 該軸承座圈1 6向外管1 2之外部壓Μ容許該内管14具 有一相對大的直徑。其有助於内管的強度和硬度且藉此避 免使用一較重的、機械固體桿或類似物。本發明之另一重 要特性係為該内管端3 2之珠緣3 6。最好參閲第四圖， -10^ 本紙張尺度適用中國國家標芈（CNS > Α4規格（210X297公嫠） ---r-L---^---^-裝------訂-----^ .線 (請先閱讀背面之注意事項再填寫本頁) A7 B7 五、發明説明（孓） 該珠緣定位為與内管1 4之座圈1 8之一對準。箱此，該 珠緣3 6將配合習知腳踏車座墊夾具之摞準凹槽僅以一座 向相對該组件1 0以確實定位該座墊。於該預定座向，該 座圈16和18將必須縱向的定位該腳踏車座墊管且，由 於該座墊管之摞準角度，該作用於内外管1 2和1 4間的 側向力將指向該袖承座圈16和18的中心•而不是作用 於該座圈16和18的側向。 本發明结合較佳實施例已被描述，熟識此技藝之人士 將理解可不脫離本發明之確實精神和範賵產生許多變化和 變型。另，其意味藉由随附權項以於本發明之確實精神和 範圍内涵蓋所有如此的變換和變型。 I----^-----^—裝-- (請先閲讀背面之注意Ϋ項再填寫本頁) 訂 線 經濟部中央標準局員工消費合作社印裝 -11- 本紙張尺度適$中國國家標準（CNS ) A4規格（210X297公釐）A7 B7 3U1636 V. Description of the invention (ί) Background of the invention Field of invention (please read the precautions on the back before filling in this page) The present invention generally relates to a suspension system for seat cushions for bicycles, especially one that provides height Seat cushion suspension system with shockproof characteristics, reliable design and low manufacturing cost. Explanation of related prior art 4 The standard of a typical low-cost bicycle includes a rigid support supported on a pair of wheels that are relatively small pneumatic tires. The lack of such a structure is that the bicycle cannot prevent the shock experienced when riding on an irregular road surface. This type of tire can generally only prevent very small vibrations. In this way, many of the vibrations experienced by the rider are directly transmitted to the rider, which makes the rider particularly uncomfortable when riding for a period of time. In addition, many recent cyclists are keen to use a mountain bike to ride in the wild. This kind of riding makes the situation generally contain very rough terrain, and the vibrations experienced by the rider may not be ignored. The Ministry of Economic Affairs, Central Bureau of Standards, Staff and Consumer Cooperatives has made many trials to improve the riding comfort of bicycles by adding various suspension systems to the design of bicycle frames. Such a system may include, for example, a shock-resistant rear suspension system including a pivoting rear brace or vibrating arm. However, this system is expensive to manufacture and adds considerable cost to the bicycle. As a result, it is generally the case that these systems are only used in expensive top bicycles. As a result, there is a need for consideration; the need to improve the comfort of relatively inexpensive or extremely low-end bicycles is mainly used to achieve the purpose of easy and pleasant riding. This paper scale is applicable to the Chinese National Standard (CNS} A4 specification (210X297 mm) printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 301636 A7 _B7_ V. Description of the invention (2) Many vibrations experienced by bicycles ride through general support Most of the rider ’s weight is transferred to the rider ’s seat cushion. To improve the comfort of the ride, the seat cushion is designed to add padding. However, this padding hinders the movement of the thigh when the rider steps on the pedal. It is required to exert effort to the part of the rider. The form of the seat cushion suspension system is known in which the seat cushion is supported by a compression spring and is preferably mounted on a seat cushion tube of the bicycle frame. The compression spring Ability to absorb the shock transmitted to the seat cushion. These systems can effectively improve the comfort of riding. One such system is, for example, U.S. Patent No. 5,044,648 issued on September 3, 1991, disclosed by Knapp. The pad suspension suspension unit is known to be missing due to the compression spring arrangement of a pad tube. Although these systems are cheaper than the rear frame, they are still very expensive for the structure and are only used for the price. The top bicycle or as an expensive repair parts market accessories. As such, the known system generally requires the use of expensive materials, specially customized parts and tight tolerance manufacturing technology. These can refer to the above mentioned Knapp The patent understands that the structure disclosed in this patent can be seen to contain a large amount of gold cutting, grinding and tapping operations to achieve a product that works together. Due to its high price, these systems are generally not used for relatively low The initial equipment manufacturing of pole bicycles. In addition, it is expected to provide a seat cushion suspension system for bicycles, and its manufacturing cost is low. This can be manufactured and applied to low pole bicycles. It is also desirable to provide such a system for bicycles Normal use raises the life to achieve satisfactory use efficiency and reliable design. Summary of the invention This paper scale is applicable to China National Standard (CNS) Α4 specification (210X29 "? Mm) (Please read the notes on the back before filling this page ) L-装 ———— 一 丁 __ V5 The Ministry of Economic Affairs Central Standards Bureau employee consumption cooperation du printed A7 B7 V. Description of the invention (3) Provide a seat plastic suspension system for bicycles to solve the lack of prior art. The seat cushion suspension system includes an external general long hollow tube and a set of internal general long joints that are received in the external tube Hollow tube. The ball sleeve bearing seat ring is set in the inner and outer tubes in the form of K-gold. The ball bearing is provided in the seat ring. The inner tube has an inner end with a sleeve K. The sleeve slides It is set in the outer tube. A compression spring is set between the inner end of the inner tube and a blocking tip extending through the outer tube. The bearing and sleeve cooperate K to allow the longitudinal movement of the inner tube in the outer tube but prevent the inner and outer tubes Relative lateral and rotational movements. With this structure, a pad suspension system can be constructed of materials prepared from standard gills and does not require expensive manufacturing steps. • Will still provide an efficient and reliable product. The drawings briefly illustrate the above and other novel features and advantages of the present invention, which will be better understood by reading the following detailed description with reference to the accompanying drawings, in which: The first picture is a bicycle seat according to the principles of the present invention The side cross-sectional view of the cushion suspension system; the second figure is the end view of the outer tube of the suspension system; the third figure is the schematic cross-sectional view at 2-3 in the second figure; the fourth figure is this The side view of the inner tube of the suspension system assembly; the fifth picture is a schematic cross-sectional view at 5-5 in the fourth; the sixth picture is an end view of the forming die constituting the assembly; the seventh picture is the sixth picture The side cross-sectional view of the forming mold at 6-6 in the middle; and the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) (please read the precautions on the back before filling this page) ". • Install-- ---- Ordered ----- ^ The A7 B7 invention description printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs) The eighth figure is a side view of the spring insertion tool used for the assembly structure. For a detailed description, refer now to the drawings, and first refer to the first picture. The vehicle seat suspension system represented in the form of a composition, generally by the reference numeral 1 billion next table. The assembly 10 includes its primary components-an external, generally elongated hollow tube 12 and an internally elongated hollow tube 14. Both long tubes 12 and 14 are preferably circular in cross-section and composed of welded seam mesh tubes in the known art. Of course, the use of tubeless tubes and various metal alloy materials is also possible. As best seen in the first to third figures, the outer tube 12 will form a pair of longitudinally opposed ball sleeve bearing rings 16 at its upper end 19 as described below. The inner tube 14 also forms a pair of complementary The seat ring 1 8. Ball bearings 20 are provided in the races 16 and 18. Although there are five ball bearings 20 in each pair of races 16 and 18 shown in the first figure, the invention does not limit any particular number of ball bearings. Also, although two pairs of opposing races 16 and 18 are shown *, the assembly 10 may have additional races if desired. Referring to the first and fourth figures, it can be seen that the inner tube 14 includes a lower neck end 22. An annular nylon sleeve 24 is mounted on the end 22 and is secured by a lateral tip 26. A compression spring 28 abuts the lower end 22 of the inner tube 14 and is held in the outer tube 12 by a lateral blocking pin 30. The sleeve 24 extends beyond the lower end 22 of the inner tube 14 to provide a groove 3 -7- This paper size is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ297 公 嫠) ------- L丨 _ {-装 ------ 訂 ----- ί. Line (please read the precautions on the back before filling in this page) A7 B7 printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs ) 1K for keeping the spring 28 aligned with the pipe end 22. The other end 32 of the inner tube 14 is provided with a circular bead 34 and an elongate bead 36. The end portion 32 is received by a suitable jig (not shown) of a bicycle seat cushion assembly, whereby the beads 34 and 36 position the seat cushion with K Yidang. The end portion 32 can also be provided with a complete fixture (not shown) by a method known in the prior art. The structure of the suspension system assembly 10 can be shown by first forming a tube 12 with a seat ring 16 A suitable mandrel can be easily achieved by pressing the mandrel into the end of the outer tube 12. Along with this, the inner tube 14 is formed with a thin chess and mandrel to include the seat ring 18, the necked end 22, and the beads 34 and 36. The inner tube 14 mounted on the sleeve 24 is then inserted into the outer tube 12 and the ball sleeve 20 is placed into the seat ring 16 and 18. Also according to the present invention, for example, as shown in the sixth and seventh figures The thin mold 40 is placed on the long tubes 12 and 14 and is forced against the outer tube seat ring 16, and the closing groove 42 of the insert 40 blocks and closes the end of the seat ring 16 to form The rounded end 44 shown in the first figure. After this operation, the long tubes 12 and 14 are prevented from being separated and the ball bearing 20 is restricted within the races 16 and 18. Furthermore, the spring 28 is inserted and compressed by a suitable tool 46 as shown in the eighth figure. The tool 46 has tines 48 and its sentry spring 28 but allows the positioning pin 30 to be inserted to hold the spring 28 in this position. A suitable accordion-shaped rubber sleeve (not shown) can be installed between the long tubes 12 and 14 to protect the internal composition of the assembly 10 from contamination by water or external substances. The assembly 10 is then clamped to the bicycle at this position (please read the precautions on the back and then fill out this page) 丨 installation. Νβ line paper size adopts China National Standard (CNS) Α4 specification ( 2 丨 0X297mm) 301636 A7 Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs B7 V. Description of Invention (έ) In the frame of the seat cushion tube, the seat cushion can be installed thereafter. In the structure of the inner and outer tubes 12 and 14, it is best to heat-treat or harden the bearing races 16 and 18, which is currently satisfactory during normal use of the assembly 10. Withstands external forces. The pipes 12 and 14 can also be chrome plated to enhance the hardness of the seat rings 16 and 18. Since the seat tube of a general bicycle frame usually forms an angle with the horizontal angle of 69 to 74 degrees, a lateral resultant force that cannot be ignored can act on the bearing 20. By this, the seat rings 16 and 18, if properly hardened, will have a longer service life. Also, preferably, as shown in the third figure, the outer tube may be provided with a set of small holes 50 for selectively receiving the blocking tip 30 at one of several longitudinal positions. In this way, the spring 28 can be preloaded to any of several degrees so that the assembly 10 can be adjusted to different resets according to the rider. It can now be understood that the seat cushion suspension system 10 of the present invention provides a highly economical component that is very different from the prior art device. The assembly 10 is constructed by relatively low-cost gold-and-bronze forming techniques such as pressing and forging. This is very different from the prior art components made by machining and metal-cutting operations such as grinding, cutting and tapping. Also, the module 10 need not be manufactured with a tight tolerance. For example, the inner tube may have any suitable inner or outer diameter, as long as it can be received in the outer tube 12 in a nested manner and the bearing race 18 and tube end 22 can be properly formed. It is also due to nylon Cannula 24 Yike to Huai and fixed inner tube 1 4. In addition, both positioning tips 26 and 30 can be in the form of known expandable spring rolling tips and the small holes through which they pass need not maintain tight tolerances. Even further, because Xu Guo's bearing 20 is too loose after assembly, the IJ II -I n IIL i II (please read the precautions on the back before filling in this page). CNS) A4 size (210X297mm) A7 _B7_ printed by Employee Consumer Cooperative of Central Central Bureau of Economics of the Ministry of Economy V. Description of invention (Γ)) The outer tube 12 can be easily formed into an oval shape (such as a vise) K Sleeve bearing 2 0 * The seat rings 16 and 18 do not need to form tight tolerances. Also, if they are too tight, the bearing 20 can be relaxed. Another practical feature of the assembly 10 is that, as disclosed, only a simple thin mold 40 M is required to bend the closed sleeve 16. This structure is satisfactory for accommodating the assembly 10 together and does not require tapping the outer tube and using some types of end caps as is known in the art. Furthermore, the sleeve 24 does not withstand sufficient lateral forces, and it can be made of relatively low-priced materials such as nylon, unlike other systems known in the art. In addition, since the sleeve does not perform any knot function as in the prior art system, it can be a simple ring-shaped member and does not have a complicated shape. A coil spring 28 replaces the use of the known rubber diffuser, allowing the use of a simple tip 30 to keep the spring 28 in position. Tips generally cannot support rubber springs in a satisfactory manner. In addition, the adjustable spring 28 preload feature does not require a known complex machine and is achieved only by the use of the positioning of the positioning pin 30. It can also be understood that although the assembly 10 is relatively simple, it has high efficiency and stable performance. The tight switches of the sleeves 12 and 14 only prevent the bicycle seat cushion from twisting undesirably in use by the bearing 20, and do not require an inner tube of a special shape. In addition, in fact, contrary to the integral grinding shown, the outer pressure of the bearing race 16 to the outer tube 12 allows the inner tube 14 to have a relatively large diameter. It contributes to the strength and hardness of the inner tube and thereby avoids the use of a heavier, mechanical solid rod or the like. Another important feature of the present invention is the bead 36 of the inner tube end 32. Please refer to the fourth picture. -10 ^ This paper scale is applicable to the Chinese National Standard (CNS > Α4 specification (210X297 public daughter) --- rL --- ^ --- ^-install ------ Order ----- ^ .Line (please read the precautions on the back before filling in this page) A7 B7 5. Description of the invention (孓) The bead is positioned to align with one of the seat rings 1 8 of the inner tube 1 4 In this case, the bead edge 36 will cooperate with the stacking quasi-groove of the conventional bicycle seat cushion fixture to face the assembly 10 only in one direction to accurately position the seat cushion. In the predetermined seat direction, the seat rings 16 and 18 The bicycle seat cushion tube will have to be positioned longitudinally and, due to the stacking quasi-angle of the seat cushion tube, the lateral force acting on the inner and outer tubes 12 and 14 will point to the center of the sleeve bearing seat rings 16 and 18 Rather than acting on the lateral sides of the seat rings 16 and 18. The present invention has been described in conjunction with the preferred embodiments, and those skilled in the art will understand that many changes and modifications can be made without departing from the true spirit and scope of the present invention. It means that all accompanying changes and modifications are covered within the true spirit and scope of the present invention by the accompanying claims. I ---- ^ ----- ^ — 装-(Please read the back first Note Ϋ items to fill out this page) set the line Ministry of Economic Affairs Bureau of Standards Co-op employees this paper scale printing equipment -11- appropriate $ Chinese National Standard (CNS) A4 size (210X297 mm)